no signal to fuel injectors no start

How long since a tune-up? Any applicable trouble codes? Engine cranking, do you have spark at the plugs and proper fuel pressure? I'm just trying to see if you have more than one problem? I don't know what testing, overall, you might have done? Key on, did you check for voltage at fuel injectors? I believe it to be the pink wire. Use a test lite to check for voltage, it is fuse protected. The ground for the fuel injector is pulsed by the computer. Two of the common reasons why the computer won't ground it, is either the security system, where applicable, or the computer doesn't see rpm signal which comes from the crank sensor. Don't replace anything unless your testing in that direction. Just my opinion.

unless your testing points in that direction.

well , I've had the truck about 3 years. An it's never put off any codes it want read codes. i have a 2 wire knock sensor located on back of the block. it has 2 wires pluging into back of it. wrapped in aluminum foil and one bare wire. The two main wires on the computer end the into the computer, but we're does the bare wire go.